Methine dyestuffs

ABSTRACT

METHINE DYESTUFFS, PROCESSES FOR THEIR MANUFACTURE AND THEIR USE OF DYEING AND PRINTING OF POLYACRYLONITRILE, COPOLYMERS OF ACRYLONITRILE WITH OTHER VINYL COMPOUNDS, ACID MODIFIED AROMATIC POLYESTERS, ACID MODIFIED POLYAMIDES, LEATHER, TANNED COTTON, CELLULOSE, POLYURETHANES AND FOR THE PRODUCTION OF WRITING LIQUIDS AND STAMPING INKS.

United States Patent 3,759,902 METHINE DYESTUFFS Hans-Peter Kuhlthau and Klaus-Friedrich Lehment,

Leverkusen, Germany, assignors to Bayer Aktiengesellschaft, Leverkusen, Germany No Drawing. Filed Aug. 17, 1971, Ser. No. 172,586

Claims priority, application Germany, Aug. 17, 1970, P 20 40 652.4 Int. Cl. C09b 23/00 US. Cl. 260240.8 10 Claims ABSTRACT or THE DISCLOSURE Methine dyestuffs, processes for their manufacture and their use of dyeing and printing of polyacrylonitrile, c0- polymers of acrylonitrile with other vinyl compounds, acid modified aromatic polyesters, acid modified polyamides, leather, tanned cotton, cellulose, polyurethanes and for the production of writing liquids and stamping inks.

The subject of the invention are methine dyestuffs of the formula wherein R represents halogen, lower alkyl, cycloalkyl, alkoxy, nitro, carbalkoxy, nitrile, acyl, acylamino, carboxylic acid amide, carboxylic acid alkylanilide, sulphonic acid amide, alkylsulphonyl, arylsulphonyl, carboxylic acid alkylamide, sulphonic acid alkylamide, trifluoromethyl or aralkyl and R represents halogen, lower alkyl, cycloalkyl, alkoxy,

nitro, carbalkoxy, nitrile, acyl, acylamino, amino, carboxylic acid amide, carboxylic acid alkylanilide, sulphonic acid amide, alkylsulphonyl, arylsulphonyl, carboxylic acid alkylamide, sulphonic acid alkylamide, trifluoromethyl or aralkyl, with at least one of the substituents R and R, representing aralkyl,

R represents hydrogen, lower alkyl, cycloalkyl, aralkyl or aryl,

R represents hydrogen or lower alkyl, which can, where appropriate, close a S-membered or 6-membered ring by joining to the adjacent position of the aryl ring B, it being possible for this heterocyclic S-membered or 6- membered ring, thus formed, to be alkyl-substituted or condensed with a further carbocyclic ring,

R represents lower alkyl, aralkyl or cycloalkyl,

R represents lower alkyl, aralkyl or cycloalkyl,

a represents the numbers 0, l, 2 or 3,

b represents the numbers 0, 1, 2 or 3 and A represents an anion,

and wherein the aromatic carbocyclic rings of the dyestutf can contain further non-ionic substituents, such as, for example, chlorine, bromine or fluorine atoms, or ethyl, methyl, methoxy, carbomethoxy, nitro or nitrile groups, and

the rings B and D can be condensed with carbocyclic rings.

3,759,902 Patented Sept. 18, 1973 ice Aralkyl can be substituted in the aromatic radical, especially by lower alkyl, halogen, nitrile, nitro, hydroxyl, lower alkoxy acylamino and/or carbalkoxy.

A further subject of the invention are processes for their manufacture, and dyestuffs obtainable in accordance with the process. The invention also relates to the use of the dyestuffs for dyeing and printing.

Possible lower alkyl groups are, for example: methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tertiary-butyl and iso-amyl.

Halogen represents fluorine, chlorine or bromine. Lower alkoxy for example represents methoxy, ethoxy, n-propoxy, iso-propoxy and n-butoxy.

Alkylsulphonyl for example represents methylsulphonyl or ethylsulphonyl, and arylsulphonyl for example represents phenylsulphonyl.

Alkoxy represents lower alkoxy and also larger radicals, for example n-undecyloxy or n-dodecyloxy. Carbalkoxy in particular represents carbomethoxy, carboethoxy, carbo-n-propoxy, carbo-isopropoxy and carbo-n-butoxy.

Suitable acyl radicals are, in particular, formyl, acetyl, n-propionyl, iso-propionyl, toluyl and benzoyl.

Suitable acylamino radicals are formylamino, acetylamino, n-propionylamino, benzoylamino, 4-chloro-benzoylamino and 4-methyl-benzoylamino.

Possible aralkyl radicals are, for example: phenylmethyl, p-phenylethyl, 'y-phenylpropyl, phenylpropyl-(2,2) and, where appropriate, their derivatives which are substituted in the phenyl nucleus.

As cycloalkyl, cyclohexyl is of particular importance.

Aryl represents carbocyclic aromatic structures with 6- 10 carbon atoms, such as phenyl and naphthyl, and their substitution products.

Carboxylic acid al-kylanilide in particular represents carboxylic acid methylanilide or carboxylic acid ethylanilide.

Carboxylic acid alkylamide for example represents carboxylic acid methylamide, carboxylic acid N,N-dimethy1- amide, carboxylic acid ethylamide and carboxylic acid N, N-diethylamide.

Sulphonic acid alkylamide radicals are, for example, sulphonic acid methylamide, sulphonic acid N,N-dimethylamide, sulphonic acid ethylamide and sulphonic acid N,N-diethylamide.

As anionic radicals A, the organic and inorganic anions which are customary for basic dyestuffs can be used, and as examples there may be mentioned: chloride, bromide, iodide, carbonate, bicarbonate, CH SO1, C H SO, p-toluenesulphonate, H30 50 disulphate, aminosulphonate, methanesulphonate, benzenesulphonate, p-chlorobenzenesulphonate, dihydrogen phosphate, phosphate, phosphomolybdate, phospho-tungstomolybdate, acetate, chloroaceta'oe, formate, propionate, lactate, crotonate, benzoate, N0 perchlorate, ZnCl the anions of saturated or unsaturated aliphatic dicarboxylic acids such as malonic acid, maleic acid, citric acid, tartaric acid, oxalic acid, itaconic acid, succinic acid, glutaric acid, adipic acid, pimelic acid and subceric, acid, as well as the anions of further organic monobasic acids with 4-30 carbon atoms. Colourless anions are preferred; for dyeing from an aqueous medium, those anions which do not excessively impair the solubility of the dyestuif in water are preferred. For dyeing from organic solvents, those anions which assist the solubility of the dyestuff in organic solvents or at least do not afiect it adversely are also frequently preferred.

A preferred group within the dyestuffs according to the invention are those of the general formula wherein A further preferred group within the dyestuffs according to the invention are those of the general formula wherein R represents methyl, ethyl or benzyl,

R represents identical or different methyl, ethyl, hydroxyl, methoxy, ethoxy, acetylamino, benzoylamino or nitro group or chlorine atoms,

R represents identical or different methyl, ethyl, cyclohexyl, methoxy, ethoxy, dodecyloxy, acetyla-mino, nitrio, carbomethoxy, carboethoxy, carboxylic acid amide, carboxylic acid methylanilide, carboxylic acid ethylanilide, sulphonic acid amide, methylsulphonyl, phenylsulphonyl, nitrile or trifluoromethyl groups and/ or chlorine, bromine or fluorine atoms,

11 represents the numbers 0, 1, 2 or 3,

u represents the numbers 0, 1, 2 or 3, and

A- represents an anion.

Particularly preferred methine dyestuifs according to the invention are those having the following general formula CH; CH CH ,4 (B3)]: 1 l' wherein R7 represents methyl, ethyl or benzyl,

R represents identical or different methyl, ethyl, hy-

droxyl, methoxy, ethoxy, acetylamino, benzoylamino or nitro groups or chlorine atoms,

n represents the numbers 0, 1, 2 or 3 and A represents an anion.

Those of the methine dyestuffs according to the invention in which the anion A- in the Formulae II-IV is the anion of a monobasic organic acid with 4-30 carbon atoms are of particular importance for deying from chlorinated hydrocarbons.

(Run

The methine dyestulfs according to the invention, of the formula R represents halogen, lower alkyl, cycloalkyl, alkoxy, nitro, carbalkoxy, nitrile, acyl, acylamine, carboxylic acid amide, carboxylic acid alkylanilide, sulphonic acid amide, alkylsulphonyl, arylsulphonyl, carboxylic acid alkylamide, sulphonic acid alkylamide, tri fiuoromethyl or aralkyl and R represents halogen, lower alkyl, cycloalkyl, alkoxy,

nitro, carbalkoxy, nitrile, acyl, acylamine, amino, carah D wherein boxylic acid amide, carboxylic acid alkylanilide, sulphonic acid amide, alkylsulphonyl, arylsulphonyl, carboxylic acid alkylamide, sulphonic acid alkylamide, trifluoromethyl or aralkyl, with at least one of the substituents R and R representing aralkyl, R represents hydrogen, lower alkyl, cycloalkyl, aralkyl,

or aryl, R represents hydrogen or lower alkyl, which can, where appropriate, close a S-membered or G-Incmbered ring by joining to the adjacent position of the aryl ring B, it being possible for this heterocyclic S-membered or 6-membered ring, thus formed, to be alkyl-substituted or condensed with a further carbocyclic ring,

R represents lower alkyl, aralkyl or cycloalkyl, R represents lower alkyl, aralkyl or cycloalkyl, a represents the numbers 0, 1, 2 or 3,

b represents the numbers 0, 1, 2 or 3 and A represents an anion,

and wherein the aromatic carbocyclic rings of the dyestuif can con tain further non-ionic substituents,

can be manufactured if, in a manner which is in itself known, amines of the formula /N E 3 Rs wherein the benzene ring B, b and the radicals R and K, have the indicated meaning,

are condensed with aldehydes of the formula wherein the benzene ring D, a and the radicals R R R and R have the indicated meaning,

or with their functional derivatives.

The condensation can be carried out by stirring the solution or suspension of equimolar amounts of the compounds V and VI in an organic or inorganic acid, or their mixture, with water at -120 C., preferably at 20- 60 C.

Suitable acids are, for example, dilute aqueous mineral acids, such as sulphuric acid, phosphoric acid or hydrochloric acid. Lower fatty acids, such as formic acid, acetic acid, propionic acid, butyric acid, lactic acid and their mixtures with Water are also suitable.

The condensation can also be carried out in a solvent such as, say, benzene, toluene, chlorobenzene, methanol and ethanol, in the presence of acid condensation agents, such as, say, phosphorus oxychloride, phosphorus pentoxide, zinc chloride, aluminium chloride, tin chloride, sulphuric acid, phosphoric acid, polyphosphoric acid or bydrochloric acid, or their mixtures.

As amines of the Formula V there may, for example, be mentioned:

4-aminodiphenylmethane, 4-aminodiphenylethane, 4-amino-4-nitrodiphenylmethane, 4-amino-4-hydroxydiphenylmethane, 4-amino-4'hydroxydiphenylpropane- (2,2 4-amino-4'-ethyldiphenylmethane, 4-arnino-4'-methyldiphenylmethane, 3-aminodiphenylmethane, 3amino-4'-methyldiphenylmethane, 3-arnin0-2,4'-dimethyldiphenylmethane, 3-amino-2,5-dimethyldiphenylmethane, 3-amino-4-methyl-2,4'-dimethyldiphenylmethane, 3-amino-4-methyl-4'-methyldiphenylmethane, 2-aminodiphenylmethane, 3-amino-2,4',6'-trimethyldiphenylmethane, 3-amino-4-methoxydiphenylmethane, 4-amino-4'-acetylamino-diphenylmethane, 4-amino-4'-benzoylamino-diphenylmethane, 4-amino-2,4,5-trimethyldiphenylmethane, 4-amino-4'-chlorodiphenylrnethane, 4-amino-4-methoxy-diphenylmethane, 4-amino-4'-ethoxy-diphenylmethane, 4-amino-2,5'-dimethyldiphenylmethane, aniline,

p-toluidine,

m-toluidine,

o-anisidine,

m-anisidine,

p-anisidine,

o-phenetidine,

p-phenetidine,

4-dodecyloxyaniline,

4-aminoacetanilide, N-benzoyl-p-phenylenediamine, 2,4-dimethoxyaniline, 2,5-dimethoxyaniline, 3,4-dimethoxyaniline, 2-chloro-4-aminoanisole, 2,4,5-trimethylaniline, 2,3,5trimethylaniline, 5-amino-2-acetylaminoanisole, 6-amino-3-methoxy-toluene, 3,4-dicyanoaniline,

p-sulphanilic acid amide, 4-aminobenzamide,

4-chloroaniline,

4-fiuoroaniline, 1,2,3,4-tetrahydro-S-aminonaphthalene, 4-amino-2,5-diethoxybenzanilide, 4-amino-2-methyl-5-rnethoxybenzanilide, 1,2,3,4-tetrahydro-G-methoxyquinoline, 4-cyclohexylani1ine,

6 2,5 -diethoxyaniline, 1,2,3 ,4-tetrahydroquinoline, Z-aminonaphthalene, Z-methyldihydroindole, hexahydrocarbazole, 4-methylaminodiphenylmethane, and t-ethylaminodiphenylmethane.

As aldehydes of the Formula VI it is for example possible to use:

1,3,3-trimethy1-2-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3,S-tetramethyl-2-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-S-chloro-Z-methylene-Z,3-dihydroindoltry-aldehyde, 1,3,3-trimethyl-5-rnethoxy-2-methylene-2,S-dihydroindolw-aldehyde, 1,3,3-trimethyl-5-carbomethoxy-2-methy1ene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-5-carbethoxy-2-methylene-2,3-dihydroindol-w-aldehyde, l,3,3-trimethyl-5-cyclohexyl-2-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-5-benzyl-2-methylene-2,B-dihydroiudoltr-aldehyde, 1,3,3-trimethy1-5-nitr0-2-methy1en.e-2,3-dihydroindo1- w-aldehyde, 1,3,3-trimethyl-7-methyl-2-rnethylene-2,3-dihydroindolw-aldehyde, 1 ,3 3 -trimethy1-S-trifluoromethyl-Z-methylene-Z, 3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-7-methoxy-2-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trirnethyl-7-chloro-2-methylene-2,3-dihydroindolw-aldehyde, 1-ethyl-3,3-dimethyl-2-methylene-2,3-dihydroindolwaldehyde, 1-ethyl-3,3,5-trimethyl-2-methylene-2,3-dihydroindolw-aldehyde, 1-ethyl-3,3-dimethyl-5-ch1oro-2-methylene-2,3-dihydroindol-w-aldehyde, 1-ethyl-3,3-dimethyl-5-methoxy-2-.methylene-2,3-dihydroindol-w-aldehyde, 1-ethyl-3,3-dimethyl-S-carbomethoxy-2-methylene-2,3-dihydroindol-w-aldehyde, 1-ethyl-3,3-dimethyl-5-carbethoxy-Z-methylene-Z,3-dihydroindol-w-aldehyde, 1-ethyl-3,3,7-trimethyl-5-cyclohexyl-Z-methylene-Z,3-dihydroindol-w-aldehyde, 1-ethy1-3,3-dimethyl-S-benzyl-2-methylene-2,3-dihydroindol-w-aldehyde, 1-ethy1-3,3-dimethyl-5-nitro-2-1nethylene-2,3-dihydroindol-w-aldehyde, 1-benzyl-3,3-dirnethyl-2-methylene-2,3-dihydroindol-waldehyde, 1-phenyl-3,3-dimethyl-2-methylene-2,3-dihydroindolw-aldehyde, 1,3,3-trirnethyl-4-benzyl-2-methylene-2,3-dihydroindolw-aldehyde, 1,3,3-trimethyl-6-benzyl-2-methylene-2,S-dihydroindolw-aldehyde, 1,3,3-trimethyl-7-benzyl-2-methylene-2,3-dihydroindolw-aldehyde, 1,3,3-trirnethy1-(6,7)-benzo-2-metl1ylene-2,3,3,4',5',6-

hexyhydroindol-w-aldehyde, 1,3,3-trimethyl-S-fluoro-Z-methylene-Z,3-dihydroindolw-aldehyde, 1,3,3-trimethyl-5-ethoxy-2-methylene-2,3-dihydroindolw-aldehyde, 1,3 ,3-trimethyl-7-ethoxy-2-methylene-2,3 -dihydroindolw-aldehyde, 1,3,3-trimethyl-5-cyano-2-methylene-2,3-dihydroindolw-aldehyde, 1,3,3-trimethy1-5-acetylamino-2-methy1ene-2,3-dihydroindol-w-aldel1yde,

7 1,3,3-trimethy1-S-methylsulphonyl-Z-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-S-phenylsulphony1-2-methylene-2,3-dihydroindol-w-aldehyde, l,3-dimethyl-3-ethyl-2-methylene-2,3-dihydroindol-waldehyde, 1,3,3-trimethyl-benzo-(6,7)-2-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl--sulphonamido-Z-methylene-2,3-dihydroindol-w-aldehyde, 1,3,3-trimethyl-S-carbonamido-2-methy1ene-2,3-dihydroindol-w-aldhyde, 1,3,3-trimethyl5-carboxylic acid ethylanilide-2-methylene- 2,3-dihydroindol-w-aldehyde, 1,3,3-trimethy1-7-ethy1-2-methylene-2,3-dihydroindolw-aldehyde, 1,3,3-trimethyl-5-chloro-7-methoxy-2-methylene-2,3-

dihydroindol-w-aldehyde, 1,3,3-trimethy1-4-ch10ro-7-methoxy-2-methylene-2,3-

dihydroindol-w-aldehyde, 1,3,3-trimethyl-4,6-dicarbomethoxy-Z-methylene-Z,3-

dihydroindol-w-aldehyde, 1,3,3-trimethyl-4,5-dichloro-7-methoxy-2-methylene-2,3-

dihydroindol-w-aldehyde, 1,3,3-trimethy1-5-chloro-4,7-dimethoxy-2-methy1ene-2,3-

dihydroindol-w-aldehyde, 1,3,3,4,5,7-hexamethyl-2-methylene-2,3-dihydroindolw-aldehyde and 1,3,3,4,6,7-hexarnethyl-2-methylene-2,3-dihydroindolw-aldehyde.

A further method for the manufacture of the dyestuffs of the Formula I is based on the condensation of N-formyl compounds of the formula (ROI,

3 (VII) wherein the benzene ring B, b and the radicals R and R have the abovementioned meaning,

with dihydroindoles of the formula the benzene ring D, a and the radicals R R R and R have the abovementioned meaning.

According to this method, the reaction is for example carried out by warming an amine of the abovementioned Formula V with formic acid in an inert solvent, say chlorobenzene, until the water formed has been separated oif azeotropically. This process is carried out at the distillation temperature of the inert solvent, for example at 100-140 C. The resulting solution of the compound of the Formula VII is treated with the equimolar amount of the methylene base VIII. An acid condensation agent is then added at room temperature, and the condensation is carried out at temperatures of 20-70 C. Suitable condensation agents are, for example, phosphorus oxychloride, phosphorus pentoxide, polyphosphoric acid, sulphuric acid and their mixtures.

Suitable amines for this reaction are, for example:

(VIII) 4-aminodipheny1methane, 4-aminodiphenylethane, 4-amino-4-nitrodiphenylmethane, 4-amino-4-hydroxydipheny1methane,

4-amino-4'-hydroxydiphenylpropane- 2,2) 4-amino-4'-ethyldiphenylmethane, 4-amino-4'-methyldiphenylmethane, 3-aminodiphenylmethane, 3-amino-4'-methyldiphenylmethane, 3-amino-2',4'-dimethyldiphenylmethane, 3-amino-2',5'-dimethyldiphenylmethane, 3-amino-4-methyl-2',4-dimethyldiphenylmethane, 3-amino-4-methy1-4-methyldiphenylmethane, Z-aminodiphenylmethane, 3-amino-2,4',6'-trimethyldiphenylmethane, 3-amino-4-methoxydiphenylmethane, 4-amino-4'-acetylamino-dipheny1methane, 4-amino-4-benzoylamino-diphenylmethane, 4-amino-2',4,5-trirnethyldiphenylmethane, 4-amin0-4'-chlorodiphenylmethane, 4-amino-4'-methoxy-diphenylmethane, 4-amino-4-ethoxy-diphenylmethane, 4-amino-2',5'-dimethyldiphenylmethane, aniline,

p-toluidine,

m-anisidine,

m-toluidine,

o-phenetidine,

p-anisidine,

o-anisidine,

p-phenetidine,

4-dodecyl0xyaniline,

4-aminoacetanilide, N-benzoyl-p-phenylenediamine, 2,4-dimethoxyaniline, 2,5-dimethoxyaniline, 3,4-dimethoxyaniline, 2-chloro-4-aminoanisole, 2,4,5-trimethylaniline, 2,3,5-trimethylaniline, 5-amino-2-acetylaminoanisole, 6-amino-3-methoxy-toluene, 3,4-dicyanoaniline,

p-sulphanilic acid amide, 4-aminobenzamide,

4-chloroaniline,

4-fiuoroaniline, 1,2,3,4-tetrahydro-5-amino-naphthalene, 4-amin0-2,S-diethoxybenzanilide, 4-arnino-2-methyl-S-methoxybenzanilide, 1,2,3,4-tetrahydro-6-methoxyquinoline, 4-cyclohexylaniline,

2,5-diethoxyaniline,

1 ,2, 3 ,4-tetrahydro quinoline, Z-aminonaphthalene, 2-rnethyldihydroindole, hexahydrocarbazole, 4-methylaminodiphenylmethane and 4-ethylamino-diphenylmethane.

2,3-dihydro-2-methyleneindoles of the Formula VIII which are suitable according to the invention are, for example:

1,3,3-trirnethyl-2-methylene-2,3-dihydroindo1e, 1,3,3,S-tetramethyl-Z-methylene-2,3-dihydroindole, 1,3,3-trimethy1-5-chloro-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-5-methoxy-2-methylene-2,S-dihydroindole, 1,3,3-trimethyl-5-carbomethoxy-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl5-carbomethoxy-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl-S-carbethoxy-Z-methylene- 2,3-dihydroindo1e, 1,3,3-trimethy1-5-cyclohexyl-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl-5-benzyl-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-S-nitro-2-methy1ene-2,3-dihydroindole, l,3,3-trimethyl-7-methyl-2-methy1ene-2,-dihydroindole,

1,3,3-trimethyl--trifluoromethyl-2-methylene- 2,3-dihydroindole, l,3,3-trimethyl-7-methoxy-2-methylene- 2,3-dihydroindole, 1,3,S-trimethyl-7-chloro-2-methylene-2,3-dihydroindole, 1-ethyl-3,3-dimethyl-2-methylene-2,3-dihydroindole, l-ethyl-3,3,S-trimethyl-Z-methylene-Z,3-dihydroindole, 1-ethyl-3,3-dimethyl-5-chloro-2-methylene- 2,3-dihydroindole, 1-ethyl-3,3-dimethyl-S-methoxy-Z-methylene- 2,3-dihydroindole, l-ethyl-3,3-dimethy1-5-carbomethoxy-2-methylene- 2,3-dihydroindole, 1-ethyl-dimethyl-5-carbomethoxy-Z-methylene- 2,3-dihydroindole, 1-ethyl-3,3-dimethyl-5-carbethoxy-Z-methylene- 2,3-dihydroindole, l-ethyl-3,3,7-trimethyl-S-cyclohexyl-Z-methylene- 2,3-dihydroindole, l-ethyl-3,3-dimethyl-5-benzyl-2-methylene- 2,3-dihydroindole, 1-ethyl-3,3-dimethyl-5-nitro-2-methylene- 2,3-dihydroindole, I-benzyl-S,3-dimethyl-2-methylene-2,3-dihydroindole, 1-phenyl-3,3-dimethyl-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-4-benzyl-Z-methylene-2,3-dihydroindole, l ,3,3-trimethyl-6-benzy1-2-methylene,2,3-dihydroindole, l ,3 ,3 -trimethyl-7-b enzyl-Z-methylene-Z, 3-dihydroindole, 1,3 ,3-trimethy1- 6,7 -benZo-2-methylene-2,3 ,3 ,4',5',6-

hexyhydroindole, 1,3,3-trimethyl-5-fiuoro-2-methylene-23-dihydroindole, 1,3,3-trimethyl-5-ethoxy-2-methylene-2,3-dihydroindole, l,3,3-trimethyl-7-ethoxy-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-5-cyano-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-5-acetylamino-2-methylene- 2,3-dihydroindole, l,3,3-trimethyl-5-methylsulphonyl-Z-methylene- 2,3-dihydroindole, 1,3,3-t1imethyl5-phenylsulphonyl-2-methylene- 2,3-dihydroindole, 1,3-dimethyl-3-ethyl-2-methylene-2,3-dihydroindole, 1,3,3-trimethyl-benzo-(6,7)-2-methylene- 2,3-hydroindole, 1,3,3-trimethyl-5-sulphonamide-2-methylenc- 2,3-dihydroindole, 1,3,3-trimethy1-5-carbonamido-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl-5-carboxylic acid ethylaniline-2- methylene-2,3-dihydroindole, 1,3,3-trimethyl-7-ethyl-2-methylene-2,3-dihydroindole, 1,3,3-trirnethyl-5-chloro-7-methoxy-2-methy1ene- 2,3-dihydroindole, 1,3,3-trimethy1-4-chloro-7-methoxy-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl-4,6-dicarbomethoxy-Z-methylene- 2,3-dihydroindole, 1,3,3-trimethyl-4,5-dichloro-7-methoxy-2-methylene- 2,3-dihydroindole, 1,3,3-trimethy1-5-chloro-4,7-dimethoxy-2-methylene- 2,3-dihydroindole, 1,3,3,4,5,7-hexamethyl-2-methylene-2,S-dihydroindole and 1,3,3,4,6,7-hexamethyl-2-methylene-2,3-dihydroindole.

urethanes, and for dyeing fibres containing lignin, such as coir, jute and sisal. They are furthermore suitable for the manufacture of writing fluids, rubber-stamp inks and ball-pen pastes, and can also be used in flexographic printing.

Suitable materials for dyeing with the basic dyestuffs of the above general formula are especially, flocks, fibres, filaments, strips, Woven fabrics or knitted fabrics of polyacrylonitrile, or of copolymers of acrylonitrile with other vinyl compounds such as vinyl chloride, vinylidene chloride, vinyl fluoride, vinyl acetate, vinylpyridine, vinylimidazole, vinyl alcohol, acrylic and methacrylic acid esters and amides and asymmetrical dicyanoethylene, or flocks, fibres, filaments, strips, woven fabrics or knitted fabrics of acid-modified aromatic polyesters, as well as acid-modified polyamide fibres. Acid-modifiedaromatic polyesters are, for example, polycondensation products of sulphoterephthalic acid and ethylene glycol, that is to say polyethylene glycol terephthalates containing sulphonic acid groups (type Dacron 64 of E. I. du Pont de Nemours and Company), such as are described in Belgian patent specification No. 549,179 and U.S.A. patent specification 2,893,816.

Dyeing can be carried out in a weakly acid liquor, in which case the goods are appropriately introduced into the dyebath at 40-60 C. and then dyed at the boil. It is also possible to dye under pressure at temperatures above C. Moreover, the dyestuffs can be added to spinning solutions for the manufacture of fibres containing polyacrylonitrile, or be applied to the unstretched fibre.

The dyeing on polyacrylonitrile, acid-modified polyesters and acid-modified polyamide are distinguished by very good fastness to light, wet processing, rubbing and sublimation and by a high afiinity for the fibre. With anionic precipitants, such as alumina, tannin, phosphotungstic and phosphomolybdic acids, the dyestuffs form lightfast pigments which can advantageously be employed in paper printing.

The dyestuffs can be employed individually or in mixtures.

Dyestufis according to the invention which have substituents which assist the solubility in chlorinated hydrocarbons, such as the tertiary butyl group, or 1ong-chain alkoxy groups, such as the dodecyloxy group, or which have anions (A- in the Formulae I to IV of monobasic organic acids with 4-30 carbon atoms, are Well suited to dyeing shaped articles made from polymers or copolymers of acrylonitrile, asymmetrical dicyanoethylene, acidmodifier aromatic polyesters or acid-modified synthetic polyamides in chlorinated hydrocarbons.

Such organic acids are, for example: 2-ethylcaproic acid, lauric acid, oleic acid, linoleic acid, a mixture of aliphatic carboxylic acids wth 15-19 carbon atoms (Versatic Acid 1519 of Messrs. Shell), a mixture of aliphatic carboxylic acids with 9-11 carbon atoms (Versatic Acid 911 of Messrs. Shell), coconut fatty acid first runnings, tetradecanoic acid, undecylenoic acid, dimethylpropanoic acid, dimethylacetic acid, carboxylic acids of which the carbon chain is interrupted by hetero-atoms, such as nonylphenol-tetraethylene glycol-ether'propionic acid, nonylphenol diethylane glycol ether propionic acid, dodecyl-tetraethylene glycol-ether-propionic acid, 3-(nonyloXy)-propionic acid, 3-(isotridecyloxy)-propionic acid, 3-(isotridecyloxy)-diethylene glycol-ether-propionic acid, ether-propionic acid from an alcohol mixture with 61() carbon atoms, nonylphenoxyacetic acid, aromatic carboxylic acids such as tert.-butyl-benzoic acid, cycloaliphatic carboxylic acid, such as hexahydrobenzoic acid, cyclohexenecarboxylic acid and abietic acid, and sulphonic acids, such as tetrapropylenebenzenesulphonic acid.

If the dyestuffs according to the invention are present as salts of the monobasic organic acids with 4-30 carbon atoms which have been mentioned, concentrated solutions, of good stability, of these dyestuffs in chlorinated hydrocarbons can be manufacture, and for these it is at times useful to add polar organic solvents whcih are completely miscible with chlorinated hydrocarbons, such as butyrolactone, dimethylformamide, methanol, dioxane, acetonitrile, methyl ethyl ketone, nitrobenzene, dimethylsulphoxide, benzonitrile and/or 2-nitrochlorobenzene.

11 12 To manufacture such solutions, the methine dyestufis volume of water containing 50 parts by volume of glacial (in the form of their free bases or as salts of organic acetic acid, again salted out with sodium chloride, sepacids with 4-30 carbon atoms) are mixed, preferably by arated oil and dried. The resulting dyestulf has the forstirring, with chlorinated hydrocarbons and monobasic mula organic acids with 4-30 carbon atoms, with the addition of the abovementioned polar organic solvents which are completely miscible with chlorinated hydrocarbons, the process 01 I on, being carried out at elevated temperature if appropriate.

In the examples, the relationship of parts by weight to CH=CH=NHCHz 01- parts by volume is as of the gram to the ml. 10 f EXAMPLE 1 23.6 parts by weight of 1,3,3- Y r ,3 It dyes materials of polyacrylonitrile, acid-modified polydihydfqindolaldehydfi and PiIrts y ight of 4- esters and acid-modified polyamide in greenish-tinged yelaminodiphenylmethane are st1rred for 4 hours at room low shades having very good fastness to li-ght and to wet temperature with parts by volume of glacial acetic acid processing, and 15 parts by Vo u e of Water, and are hen dilut d wit Similar valuable dyestuifs are obtained in an analogous 1000 parts by volume of water. The resulting dyestuif manner on using the following aldehydes and amines. The

is salted out with 50 parts by weight of sodium chloride, colour shades indicated relate to the dyeing of polycaryloseparated from the solution, redissolved in 1500 parts by 20 nitrile.

TABLE Aldehyde Amine Colour shade 1,3,3-trimethyl-2-methylene-2,B-dihydroindol-waldehyde 4-aminodiphenylme hane Yellow. 1 ,3,3,fi-tetramethyl2-methylene-2,3-dihydroindoLw-amehyde o Do. 1,3,3-trimethyl-5-methoxy-2-methylene-2,3-dihydroindol-w-aldehyde Do. 1,3,3-trimethyl-5-0arbometh0xy-2-methylene-2,4-dihydroindol-w-aldehyde Greelrlnsh-tmged ye ow. 1,3,3,-trlmethyl-5-earboethoxy-Z-rnethylene-2,3-dihydroindol-w-aldehyde do Do. 1 ,3,3,-trin1ethyl-5-cyclohexyl-2-meth ylene-2,3-dihydroindol-w-aldehyde do Yellow. 1,3,3-trimethyl-S-benzyl-2-methylene-2,3-dihydroindol-m-aldehyde do o. 1,3,3-trimethyl-5-nitro-2-methylene-2,3-dihydroindol-w-aldehyde .do Redfiish-tinged ye ow. 1,3,3-trimethyl-7-meth yl-2-methylene-2,B-dihydrQindoHQ-aldehyde do Yellow. 1 ,3,3-trimethyl-5-trifiuoro methyl-2-methylene-2,3-dihydroindol-w-aldehyde do Do. 1,3-3-tiimethyl-7-methoxy-2-methylene-2,3-dihydroindol-w-aldehyde do Do. 1,3,B-trimethyl-7-ehloro-2-methylene-2,3-dihydroindol-w-aldehyde "do. D0. 1ethyl-3,3-dimethyl-Z-methylene-2,3-dihydroindol-w-aldehyde. do Do. 1-ethyl-3,3,5-trimethyl-2-methylene-2,3-dihydroindol-waldehyde. do Do. 1ethyl-3,3-dimethyl-S-chloro-2-methylene-2,3 -dihydroindol-w-a1dehyde do. Gretfifish-tinged ye ow. 1-ethyl-3,3-dimethyl-5-methoxy-2-rnethylene-2,3dihydroindol-w-aldehyde do Yellow. l-etllylll-iia1-dimethyl-5 carboethoxy-2-methylene-2,3-dihydroindo1-w- --...d0 o.

a e y e. 1egh3 %;3g-dimethyl-5-eyclohexyl-2-methylene-2,3-dihydroindol-w do Do.

a e y e. l-ethyl-3,3-dirnethyl-5-benzyl-2-methylene-2,3-dihydroindol-w-aldehyde do Do. 1-ethyl-3,3-dimethyl-5-nitro-2-methylene-2,3-dihydroindol-w-aldohydes i do. Do. Mixture of 1,3,3-trimethyl-4-methyl-2-methylene-2,fl-dihydroindol-wc do Do.

algelfiyge and 1,3,3-tn'methyl-6-methyl-2-methylonc-2,3-dihydroindol-w a e y e. 1,3,3-trimethyl-(6,7) -benzo-2-methylene-2,3,3,4,5,6,-hexahydroindol-wdo Reddish-tinged aldehyde. yellow. 1,3,3-trimethyl-S-fluoro-2-rnethylene-2,3-dihydroindol-w-aldehyde do Yellow. 1 ,3,3-trimethyl-5'ethoxy-2-methylene-2,3 dihydroindol-w-aldehyde do 1 Do. 1 ,3,3-trimethyl-7-ethoxy-2-methylene-2,3-dihydroindol-w-aldehyde o Do. 1,3,3-trimethy1-5-cyano-Z-methylene-2,3-dihydroindol-w-aldehyde do Greefilish-tinged ye ow. 1,3,3-trimethyl-5-acetylarnino-Z-methylene-Z,3-dihydroindol-w-aldehyde ..d0 Yellow. 1 ,3,3-trin1ethyI-S-methylsulphonyl-Z-methylene-2,3-dihydroindol-waldehyde D0. 1 ,3,8-trimethyl-5-phenylsulphonyLZ-methylene-2,3-dihydroindol-w-aldehyde Do. 1,3dimethyl-3-ethyl-2-methylene-2,3-dihydroindol-w-aldehyde Do. 1,3,3-trimethyl-6,7-benzo-2-methylene-2,3-dihyd1oindol-w-aldchyde Do. 1,3,3 trimethyl-5sulphonamido-2-methylene-2,3-dihydroindol-w-aldehyde Do. 1,3,3-trimethyl-5-carbonamido-2-methylene-2,S-dihydroindol-w-aldehyde..- do Do. 1 ,3,3-lignfietiyl-carboxylic acid ethylanilide-Z-methylene-2,3-dihydroindoldo Do.

w-a e y e. 1,3,3-trimethyl-7-ethyl-2-methylene-2,3-dihydroindol-w-aldehyde e do Do. 1,3,3-13rimethyl-5-chloro-7-methoxy-2-rnethylene-2,3-dihydroindol-w-aldehydo do Do. 1 ,3,3-trimethy1-4-chloro-7-methoxy-Z-rnethylone-2,3-dihyd1oindol-w-aldehyde. do Do. 1,iii3grimethy1-4,6-diearbomethoxy-2-rnethylene-2,a-dihydroindol-w-aldedo Do.

y e. 1,3,3-igimethyl-4,5-dichloro-7-rnethoxy-2-methylene-2,3-dihydroindol-w-aldedo Do.

y e 1,iii3-grimethyl-5-ehloro-4,7-dirnethoxy-2-methylene-2,3-dihydroindol-w-aldedo Do.

y e. 1,3,3,4,5,7-hexarnethyl-2-rnethylene-2,3-dihydroindol-w-aldehyde ,do Do. 1,3 3,4,6,7-hexamethyl-Z-methyIene-ZBdihydroindol-w-aldehyde. do Do. 1,3,3 trimethyl-5-chloro-2-methylene-2 3-dihydroindol-w-aldehydec 4-aminodiphenylethane Do. D 4-amino-4-nitrodiphenylmethane Do. 4-amino-4-hydroxydiphenylrnethane. Do. 4-amino-4-hydroxyphenylpropane (2,2) Do.

4-amino-4-ethyldiphenylmethane Greelrllish-tinged ye ow. 4-arnirro-4-methyldiphenylmethane Do. 3-aminodlphenylmethane Yellow. 3-arnino-4-methyldiphenylmethane Do. 3-amino-2,4'-dimethyldiphenylmethane. Do. B-amino-Z ,5 -dimethyldiphenylmethane Do. 3-amino-4-methyl-2,4-dimethyldiphenylmethane Do. 3-arnin0-4-methyl-4-methyl-di phenylmethane Do. 2-arninodiphenylmethane Do. 3-amino-2,4 ,6-trimethy1diphenylmethane Do. 3-amino4-methoxy-diphenylmethane Do. 4-amino-4-acetylarnino-diphenylmethane D0. 4-ami -2 ,4 ,5'-trimethyldi phenylmethane Do. 4-arnino-4 -chloro-diphenylmethane Do. 0 4-amino-4-methoxy-diphenylrnethane Do. 1,3,3-t1imethyl-5-carbornethoxy-Z-methylene-2,3-dihydroindol-w-aldehyd 4-amino-4-methoxy-diphenylrnethane Do. Do. 4-arnino-4-ethoxy-diphenylmethane Do.

approx. 65 parts by volume of liquid are distilled off;

T.-\BLECntinue(l Aldehyde Amine Colour shade 1,3,3-trimothyl--chloroQ-methyleno-2,3-dihydroindohwaltlehyde. 4-amino-V-etlloxy-diphenyl1nothane Do.

D 4-amino-2,5"dimethyl-diphenylmethane Do. 1 3,3-trimothyl-5-benzyI-Z-methyleno-2,3-(lihydroilldol-waldflllytle Anil n Gree r iish-tinged ye ow.

Do. p'-Toluidine Do.

Do m-T0luidine D Do o-Anisidine. Y ll w,

Do m-Am idine. Greenish-tinged Do. D-Al'liSldlIlGL D0. o-Pheneti ine Yellow.

p-Phenet1d1ne Greenish-tinged I I yellow.

Do" 4-dodeeyloxyan1hne. Yellow.

D 4-amin0acetanilide Greenlsh-tlnged yellow.

N-benzoyl-pphenylenediamine Do.

2,4-dimethoxyanllme Reddish-tlnged yellow.

2,5-d1methoxyaniline D0.

D0. 3,4-dimethoxyaniline D 3,4-diisopropoxyaniline D Do 2-chloro-4-aminoanisole" Yellow.

D 2,4,5-trimet hy1aniline Greenislptlnged low.

2,3,5trimethylaniline y D D0 5-amino-2-acetylamino-anisole Reddish-tinged ellow.

D0 6-amino-3-methoxy-toluene fli ellow.

3,4-dicyanoaniline Do.

Do. p-Sulphanilic acid amide D Dok 4-amino-benzamlrle Do.

130-. 4-ch1oroani1ine Greenish-tinged yellow. 4-fluor0an1line Do. 1,2,3, i-tetrahydro-S-aminonaphthalene Yellow. 4-am1no-2,5-diethoxy-N-benzoylaniline Yellowish-tinged orange.

4-am1no-2-methyl-5 methoxy-N-benzoyl-anillne Yellow.

Do 4-cyclohexylamlme Greenish-tinged yellow.

D0" 2,5-d1ethoxyaxnllne Yellow.

2 amino naphthalene D0.

2-methyl-2,3-dihydroindo e Greenish-tlnged Do 1,2,3,4-tetrahydroquinoline y Do.

Do Hexahydrocarbazole Yellow.

1,2,3,4-tetrahydro-S-methoxyquinoline Do. 1,3,3-trimethyl-54:hloro-2-methylel1e-2,3-dihydr0ind0lw-aldehydB 4-methylarnino-diphenylmethane Do.

D 4-ethylam1no-diphenyl-methane Greenish-tinged yellow. 1,3,fitringethyl-ii-(p-methoxy)-benzyl-2-methylene-2,3-dihydro1ndol-wp-Amstdine- D a e y e.

Do 2-methyl-2,3-dihydrolndole Do.

1,3iigtrimethyl-fi-(p-methyl)-benzyl-2-methylelle-Z,3-d1hydr0ind01- p-Anisidine Do.

a ehyde.

Do Z-methyl-Z,3-dihydroindole Do.

1,agtigimethyle-(p-ch1or0)-benzyl-2-methylene-2,3-dlhydromdo1-wp-Am'siriinp a e yde.

Do 2methyl 2,3-dihydroindole Do. Mixture of 1,3,s-tnmethylt-benzyl-2-methylene-2,3-dihydr0indo1 np-Anisidine Do.

algegyge and 1,3,3-trimethyl-6-benzyl-Z-methylene-2,3-dihydroindol-wa e y e.

o 2-Inethyl-2,3-dihydroindole Do. 1,3,3-trimethyl-7-benzyl-2-methylene-2,3-dihydroindol-w aldellyde p-Anisidine Do. o 2-methyl-2,3-dihydroinclole Do. 1,lifiitigngthy1-7-(p-methoxy) -benz yl-2-methy1ene-2,3-dihydroindolwzp-Anisidine Do.

a e y e- Do 2-methyl-2,3-dihydroindo1e Do.

1,3,l3dtrimet hyl-7-(p-methyl)-benzyl-2-methylene-2,3-dihydroindol-wpAnisidinm Do.

a ehyde.

Do Z-methyl-Z,B-dihydrolndole Do. 1,3,S-trimetllyl-5-earbomethoxy-2-methylone-2,3-dihydroindol-w-aldehyde. 4-amino- 4-methy1diphenylmethane D0. 1,3,3-trimethyl-5-benzyl-2-methylene-2,3-dihydroindol-w-aldehyde N-methyl-p-anisidine Yellow. l-henzyl-3,3-dimethyI-Z-methylene-2,3-dihydroindol-w-aldehyde 4-aminodiphenylmethane. Do. 1,3,3-trimethyl-2-methylene-5-benzy1-2,3-dihydroind0l-w-aldehyde 1,2,3,4-tetrahydroquinoxaline Red(lflish-1;ing0d ye low. EXAMPLE 2 55 table accompanying Example 1, and has the formula A mixture of 13.3 parts by weight of 2-methyl-2,3-di- CH3 hydroindole, 10 parts by volume of formic acid and 120 2 CHa. parts by volume of chlorobenzene is slowly warmed, I Cb whilst stirring, ultimately to 140 C., and at the same time 60 fy the distillation residue is then cooled to C. 16 parts by weight of phosphorus oxychloride are then stirred in and subsequently 26.4 parts by weight of 1,3,3-trimethyl-S-benzyl-Z-methylene-Z,3-dihydroindole are added dropwise whilst stirring. The mixture is stirred for 15 minutes without heating and then for 3 hours at C. The dyestufi is separated from the'solvent, redissolved in 1000 parts by volume of water and precipitated with sodium chloride. It dyes materials of polyacrylonitrile, acid-modified polyesters and acidmodified polyamide in clear greenish-tinged yellow shades of excellent fastness to light and to wet processing. It is identical with the dyestuff from 1,3 ,3-trimethyl-5-benzyl-2-methylene-2,3-dihydroindol waldehyde and 2-rnethyl-2,3-dihydroind0le mentioned in the CH3 CH3 A valuable yellow dyestutf is also obtained if instead of 1,3,3-trimethyl-5-benzy1-2-methylenedihydroindole the equivalent quantity of 2,3,3-trimethyl-S-benzylindolenine is employed.

EXAMPLE 3 A woven fabric of polyacrylonitrile is printed with a printing paste which was prepared in the following manner:

330 parts by weight of hot water are poured over 30 parts by weight of the dyestutf described in Example 2, 50 parts by weight of thiodiethylene glycol, 30 parts by weight of cyclohexanol and 30 parts by weight of 30% strength acetic acid, and the resulting solution is added to 500 1 5 parts by weight of crystal gum (gum arabic as a thickener). Finally, 30 parts by weight of zinc nitrate solution are also added. The print obtained is dried, steamed for 30 minutes and subsequently rinsed. A yellow print of very good fastness properties is obtained.

EXAMPLE 4 Acid-modified polyglycol terephthalate fibres are introduced at 20 C., using a liquor ratio of 1:40, into an aqueous bath which per litre contains 3-l0 g. of sodium sulphate, 0.1-1 g. of oleyl-glycol-ether (50 mols of ethylene oxide), -l5 g. of dimethyl-benzyl-dodecylammonium chloride and 0.15 g. of the dyestuff described in Example 2, and which has been adjusted to pH 4-5 with acetic acid. The bath is heated to 100 C. over the course of 30 minutes and kept at this temperature for 60 minutes. Thereafter, the fibres are rinsed and dried. A yellow dyeing having very good fastness properties is obtained.

EXAMPLE 5 Polyacrylonitrile fibres are introduced at 40 C., using a liquor ratio of 1:40, into an aqueous bath which per litre contains 0.75 g. of 30% strength acetic acid, 0.38 g. of sodium acetate and 0.15 g. of the dyestutf described in Example 2. The bath is heated to the boil over the course of 20-30 minutes and kept at this temperature for 30-60 minutes. After rinsing and drying, a yellow dyeing having very good fastness properties is obtained.

EXAMPLE 6 A stock solution is prepared from 15 parts by weight of the dyestuff mentioned in Example 2, 15 parts by weight of polyacrylonitrile and 70 parts by weight of dimethylformamide, and is added to a customary polyacrylonitrile spinning solution, which is spun in a known manner. A greenish-tinged yellow dyeing having very good fastness properties is obtained.

EXAMPLE 7 Acid-modified polyamide fibres are introduced at 40 C., using a liquor ratio of 1:40, into an aqueous bath which per litre contains g. of sodium acetate, l-5 g. of oleyl-polyglycol-ether (50 mols of ethylene oxide) and 0.3 g. of the dyestulf described in Example 2, and has been adjusted to pH 4-5 with acetic acid. The bath is heated to 98 C. over the course of 30 minutes and kept at this temperature for 60 minutes. Thereafter the fibres are rinsed and dried. A greenish-tinged yellow dyeing having very good fastness properties is obtained.

EXAMPLE 8 Acid-modified polyester fibres are introduced, using a liquor ratio of 1:10, into a perchloroethylene bath which per litre contains 1 g. of oleic acid ethanolamide, 1 g. of the reaction product of 1 mol of oleyl alcohol with 20 mols of ethylene oxide, 8 g. of water and 1 g. of glacial acetic acid, as well as 1 g. of the dyestuff from 1,3,3-trimethyl-5-benzyl-2-methylene 2,3 dihydroindol-w-aldehyde and 4-dodecyloxyaniline, mentioned in the table accompanying Example 1. The dyebath is heated to 100 C. for 60 minutes in a closed dyeing apparatus. Thereafter, the fibres are rinsed and dried. A yellow dyeing having good fastness properties is obtained.

EXAMPLE 9 The dyestuff from 1,3,3-trimethyl-5-benzyl-2-methylene- 2,3-dihydroindol-w-aldehyde and p-anisidine mentioned in the table accompanying Example 1 is converted into the dyestuff base in the usual manner. 25 parts of this dyestufl base are suspended in 150 parts of perchloroethylene and 65 parts of butyrolactone, followed by parts by weight of Z-ethylcaproic acid, are added. The dyestulf dissolves to give a yellow colour shade. The solution is left stirring for a further hour at 50 C. and is filtered after having again been cooled to room temperature. A stable solution is obtained, which is outstandingly suitable for 16 dyeing polyacrylonitrile materials from chloro-hydrocarbon solutions.

EXAMPLE 10 50 parts of a fibre yarn from anionically modified polyacrylonitrile are introduced, at 22 C., into a dyebath which consists of a mixture of 4 parts of the solution of dyestuff in perchloroethylene described in Example 9, 4 parts of oleic acid ethanolamide, 4 parts of the reaction product of 1 mol of oleyl alcohol with 20 mols of ethylene oxide, 1 part of glacial acetic acid and 8 parts of water in 983 parts of perchloroethylene. The bath is brought to C. over the course of 30 minutes, Whilst vigorously circulating the liquor, and is kept at this temperature for one hour. After this time, the liquor is separated off and the yarn is freed of adhering solvent in a stream of air. A yellow dyeing is obtained.

Patent Claims:

1. Methine dyestuff of the formula:

wherein R and R represent halo, lower alkyl, cyclohexyl, alkoxy of 1-12 carbon atoms, nitro, carbalkoxy of 1-4 carbon atoms in the alkoxy portion, nitrilo, formyl, acetyl, n-propionyl, iso-propionyl, toluyl, benzoyl, formylamino, acetylamino, n-propionylamino, benzoylamino, 4 chloro benzoylamino, 4-methyl-benzoylamino, carboxylic acid amide, carboxylic acid alkyl-anilide of 1-2 carbon atoms in the alkyl portion, sulphonic acid amide, methylsulphonyl, ethylsulphonyl, phenylsulphonyl, carboxylic acid alkylamide of 1-2 carbon atoms in either or both of the alkyl portions, sulphonic acid alkylamide of 1-2 carbon atoms in either or both of the alkyl portions, trifluoromethyl, phenylalkyl of 1-3 carbon atoms in the alkyl portion, substituted phenylalkyl of l3 carbon atoms in the alkyl portion wherein the substituents are attached to the phenyl nucleus and are selected from the group consisting of lower alkyl, halo, nitrilo, nitro, hydroxyl, lower alkoxy, formylamino, acetyl-amino, n-propionlylamino, benzoylamino, 4- chloro-benzoylamino, 4-methylbenzoylamino, and carbalkoxy of l-4 carbon atoms in the alkoxy portion; with the provision that at least one of R and R is said phenylalkyl or said substituted phenylalkyl; and that R.;, additionally represents amino;

R represents hydrogen, lower alkyl, cyclohexyl, aromatic carbocycle of 6-10 carbon atoms and substituted aromatic carbocycle of 6-10 carbon atoms where the substituents are selected from the group consisting of chlor0, bromo, fluoro, ethyl, methyl, methoxy, carbonmethoxy, nitro, and nitrilo, and R additionally represents phenylalkyl of 1-3 carbon atoms in the alkyl portion, and substituted phenylalkyl of 1-3 carbon atoms in the alkyl portion, and substituted phenylalkyl of 1-3 carbon atoms in the alkyl portion where the substituent is attached to the phenyl nucleus and is selected from the group consisting of lower alkyl, halo, nitrilo, nitro, hydroxyl, lower alkoxy, formylamino, acetylamino, npropionylamino, benzoylamino, 4-chlorobenzoylamino, 4-methylbenzoylamino, and carbalkoxy of 1-4 carbon atoms in the alkoxy portion;

R represents hydrogen, lower alkyl, or lower alkylene of 2-3 carbon atoms when joined to ring B ortho to the carbon to which the nitrogen is attached to form a S-membered or 6-membered ring, which ring may be unsubstituted or substituted by lower alkyl;

R and R represent lower alkyl, cyclohexyl, phenylalkyl of l-3 carbon atoms in the alkyl portion, or unsubstituted phenylalkyl of 1-3 carbon atoms in the alkyl portion where the substituent is attached to the phenyl nucleus and is selected from the group consisting of lower alkyl, halo, nitrilo, nitro, hydroxyl, lower alkoxy, formylamino, acetylamino, n-propionylamino, benzoylamino, 4-chloro-benzoylamino, 4-methyl-benzoylamino,

wherein R represents methyl, ethyl or benzyl, R represents identical or different methyl, ethyl, hydroxyl, methoxy, ethoxy, acetylamino, benzoylamino, nitro 5 or chloro,

t f i of carbon atoms m the R represents identical or different methyl, ethyl, cycloa an b P f numbers 2 hexyl, methoxy, ethoxy, dodecyloxy, acetylamino, nitro, A represents an amon an carbornethoxy, carboethoxy, carboxylic acid amide, carwherein m boxylic acid methylani lide, carboxylic acid ethylanilide,

of the tam further 11011-101110 substituents, and the rings B and n reresemsthe numbers 0 or 3 I s 5 3 a i condensed with carbocychc rmgs' 11 represents the numbers 0, 1, 2 or 3, and

. ethme dyestulf of the formula represents an anion 1 cm CH a) (Rt)u (CHM l- CH=CH-NH wherein 4. Methine dyestutf of the formula R represents methyl, ethyl or benzyl, I" R represents identical or different methyl, ethyl, hydroxyl, methoxy, ethoxy, acetylamino, benzoylamino, nitro, on, r

or chloro, (R CH=CH-N R represents identical or different methyl, ethyl, cycloa N hexy], methoxy, ethoxyl, dodecyloxy, aeetylamino, nitro, in CH;

carbomethoxy, carboethoxy, carboxylic acid amide, carwherein boxylic acid methylanilide, carboxylic acid ethylanilide,

sulphonic acid amide, methylsulphonyl, phenylsulphonrepresents P Y ethyl Q benzy],

Y1 nitrile, trifluoromethyl, ch10), bmmo or fluoro, R represents identical or dlfferent methyl, ethyl, hydroxm represents the numbers 1 or 2, it, glrltleghgxy, ethoxy, acetylamino, benzoylamino, nitro, n represents the numbers 0, 1, 2 or 3, I u represents the numbers 0, 1, 2 or 3 and 2: esents the mmibers 2 or 3 and A represents an anion. 40 represents an 5. Methine dystulf according to claim 2, wherein R =methyl.

6. A methine dystulf of the formula OH; 3. Methine dyestuff of the formula -CH CH=CHN CH, (R011 A- \N/ (Ron CH=CH-NH- 47H: H:

N 50 7. A methine dyestutf of the formula C H o1 Hl 8. A methine dyestuff of the formula HaC O O C- CH:

(DH-CH NH on N H: 9. A methine dyestuff of the formula e C C 01- H: H-NHGO m, 3H;

19 20 10. A methine dyestuff of the formula FOREIGN PATENTS 1,214,896 11/1959 France 260240 G @4311, -CH:

Ck JOHN D. RANDOLPH, Pnmary Exammer CH=OH NH 5 US. Cl. X.R.

(3H, 83, 12, 22, 54.2, 62, 177 R, 178 E, 178 R; 106176;

References Cited UNITED STATES PATENTS lUNt'll ll) sjm'rus" IP 1 N1 FFICE CERTIFICATE U1 CORRECTION Patent No. 3,759,902 Dated ,September 18, 1973 Inventor) Hans Peter Kuhlthau et al It is certified that error appears in the above-identified patent 'and that said Letters Patent are hereby corrected as shown below:

"Column 4, lifi, l, "deying" should read dyeing.

Column 12, linel9, "polycarylo-" should read '--v--"polyacrylo- 'Column 17, Claim 3, in the formula,

N should read Column 18, Claim 8 in the formula, Delete "H COOC".

- Signed and sealed this 31st day of December 1974.

' (SEAL) Attest McCOY M. Gl BSON JR. 0. MARSHALL DANN attesting Officer Commissioner of Patents FORM PO-IOSO (10-69] USCOMM-DC GOING-P69 uvs. sovnuusm nmmm: omcz; I!" o-uG-au t 

